Zeng Yonghui, Jiao Nianzhi
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, PR China.
J Microbiol. 2007 Jun;45(3):205-12.
Anoxygenic photosynthesis, performed primarily by anoxygenic photosynthetic bacteria (APB), has been supposed to arise on Earth more than 3 billion years ago. The long established APB are distributed in almost every corner where light can reach. However, the relationship between APB phylogeny and source environments has been largely unexplored. Here we retrieved the pufM sequences and related source information of 89 pufM containing species from the public database. Phylogenetic analysis revealed that horizontal gene transfer (HGT) most likely occurred within 11 out of a total 21 pufM subgroups, not only among species within the same class but also among species of different phyla or subphyla. A clear source environment feature related phylogenetic distribution pattern was observed, with all species from oxic habitats and those from anoxic habitats clustering into independent subgroups, respectively. HGT among ancient APB and subsequent long term evolution and adaptation to separated niches may have contributed to the coupling of environment and pufM phylogeny.
不产氧光合作用主要由不产氧光合细菌（APB）进行，据推测在30多亿年前就已出现在地球上。长期以来已确定的APB分布在几乎每个有光的角落。然而，APB系统发育与源环境之间的关系在很大程度上尚未得到探索。在这里，我们从公共数据库中检索了89个含pufM物种的pufM序列及相关源信息。系统发育分析表明，水平基因转移（HGT）最有可能发生在总共21个pufM亚组中的11个亚组内，不仅发生在同一类别的物种之间，也发生在不同门或亚门的物种之间。观察到了与源环境特征相关的明显系统发育分布模式，所有来自有氧生境的物种和来自无氧生境的物种分别聚类为独立的亚组。古代APB之间的水平基因转移以及随后长期的进化和对不同生态位的适应可能促成了环境与pufM系统发育的耦合。
